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How can I define a composite primary key in SQL?
...rID)
);
The pair (QuestionID,MemberID) must then be unique for the table and neither value can be NULL. If you do a query like this:
SELECT * FROM voting WHERE QuestionID = 7
it will use the primary key's index. If however you do this:
SELECT * FROM voting WHERE MemberID = 7
it won't because...
How do I use CMake?
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CMake takes a CMakeList file, and outputs it to a platform-specific build format, e.g. a Makefile, Visual Studio, etc.
You run CMake on the CMakeList first. If you're on Visual Studio, you can then load the output project/solution.
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Why is a combiner needed for reduce method that converts type in java 8
I'm having trouble fully understanding the role that the combiner fulfils in Streams reduce method.
4 Answers
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Android: Why does long click also trigger a normal click?
I have a ListView with listeners for a long click and a regular click.
4 Answers
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PDO get the last ID inserted
I have a query, and I want to get the last ID inserted. The field ID is the primary key and auto incrementing.
3 Answers
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How to use continue in jQuery each() loop?
In my application i am using AJAX call. I want to use break and continue in this jQuery loop.
4 Answers
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What are “signed” cookies in connect/expressjs?
...igure out what "signed cookies" actually are.
There isn't much on the net, and if I try this:
4 Answers
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Eclipse: Files opened by multiple searches using same editor tab
...I then use the "file search" function again to find some other bit of text and this time double click on the file "B.java", this file will replace "A.java" in the editor.
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How to drop multiple columns in postgresql
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You can even leave out 'COLUMN' and use ALTER TABLE table DROP col1, DROP col2;
– Ondrej Burkert
Sep 11 '15 at 10:45
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Is there a date format to display the day of the week in java?
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SimpleDateFormat sdf=new SimpleDateFormat("EEE");
EEE stands for day of week for example Thursday is displayed as Thu.
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